By the time I had driven to the location, got through security and decided where to shoot the picture it was well into the afternoon on a winter day. If the sun is in the right place and you have the right conditions this can be a wonderful time to shoot this kind of picture.
I couldn't show anything that might give too much away and so we decided that the front of an Army truck with a Military ambulance in the background was pretty safe. My subject wasn't actually in shadow in this picture but the angle of the sun was throwing my shadow across some of his body. Decided to use my custom Lumedyne head with a 200 joule Signature series pack. No light modifier (no umbrella or soft box) other than a bit of frost filter (thin white paper type material) over the reflector. I placed the flash about three metres from my subject and turned the power up to full. The flash was about sixty degrees from the access of the lens and ten dgerees above his eye line.
I took an available light reading through the lens of 1/250th at f11 to properly expose the sky and so I fired a couple of test frames at 1/250th at f16 aiming to underexpose the sky by a single f-stop.